Did you install the ESC and motor? Do you have a manual for the ESC? You may need to reset the ESC and do a calibration on it. I have no experience with that ESC, and don't even know what it is. I see it is a Novak. Maybe
@Greywolf74 has some ideas? But I would definitely change that battery connector out. Those Tamiya plugs are from like the 80's and are pretty crappy.